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The  BMS16 was designed to address the need for a simple, reliable and easy to install Battery Management System for 24V to 48V lithium battery packs. It can be used for both storage battery applications (off-grid systems, backup batteries etc) or electric vehicle applications (golf carts, NEVs, motorbikes, mobility scooters, etc).

The BMS16 features dual solid state relay outputs capable of directly switching large contactors for protecting against under- and over-voltage conditions, an isolated CAN bus interface for communicating with a monitor, external current sensor and/or third party devices, a temperature sensor input for monitoring and protecting against under- and over-temperature conditions, and an isolated shunt interface for current measurement and battery state of charge calculation. It also handles pack balancing via internal shunt resistors to bleed a small amount of power from any cells above average voltage at any time.

The BMS16 uses a built-in isolated switchmode DC/DC converter to power itself off the batteries it is connected to, to avoid the need for any separate power supply. To prevent the possibility of over-discharge caused by the BMS itself, it can switch its own power off if any cells get critically low. There is also a Sleep terminal which can be used to put the BMS into a low power mode when the battery is not in use, turning off the CAN bus and SSR outputs to greatly reduce quiescent current consumption.

For battery storage applications, the BMS16 uses programmable hysteresis bands for the high and low voltage thresholds, to allow for automatic operation (no need for manual resets) without rapidly cycling external devices. For example, the BMS16 may disable the charger when a cell hits 3.8V, then will automatically re-enable it some time later when the cell drops below 3.4V. In EV mode, outputs will stay off until the unit is power cycled, or wakes from sleep.

The BMS is normally configured using one of our V3 Monitors, however the BMS can work fine without a monitor attached. In this case the BMS can be preconfigured to suit your system before shipping - feel free to contact us after ordering with your requested settings.


New features for Version 3:
Isolated CAN bus interface as standard (better compatibility with third party devices)
Isolated shunt interface (more robust and can be installed at either end of pack)
More accurate current measurement (8x higher digital oversampling), and up to twice the shunt's continuous rating can be read intermittently. (Continuous use above current rating may cause shunt to overheat.)
New connector with dedicated B+ terminal (to optionally avoid measurement errors on most positive cell)

Cells managed: 8 to 16 cells
Supported chemistries: LiFePO4, LiCo, LiPo, LiMn
Maximum total voltage: 70V
High, low and shunt voltage thresholds: Factory configurable between 2.00-4.50V
Accuracy: 0.001V
Dual solid state relay (SSR) isolated outputs, 70V 1A max
Built-in current measurement via isolated shunt interface
Isolated CAN bus interface for external monitor, hall effect current sensors, TC chargers, etc.
Status LED for visual feedback
Internal switchmode power supply
Internal shunt balancers (~80mA)
Dimensions: 120x80x18mm
Mounting holes: 2x Ø4mm, 110mm apart


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